Electric air-compressor.



A. F. BATGHELDER.

ELBUTBIG AIR OGMPBEBBOR.

APPLICATION FILED SEPT. 3, 1901. 947,5 2, Patented Feb. 1,1910.

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ELECTRIC! AIR GOMPRBSSOR.

APPLICATION FILED SEPT. 3, 1901.

Patented Feb. 1, 1910.

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A.F.BATGHELDBR. ELBU'IEIO AIR UOMPRESSOE. APPLICATION FILED SEPT. 3, 1901. 7, 2, Patented Feb. 1,1910.

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A. F. BATCHELDBR. ELECTRIC! AIR GOMPRBSSDR. LPPLIIOATIOVH TILED SEPT. a, 1901.

947,882, Patented Feb. 1, 1910.

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Hsa F. Balichelder.

UNITED, STATES PATENT OFFICE.

ASA F. BATGHELDER, OF SCHENECTADY, NEW YORK, ASSIGNOR T GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

ELEdTRIG amroomrnnsson.

To till whom it may concern:

Be itrknown that I, Asa F. .BATCHELDER, a citizen of the United States, residing at Schenectady, county of-Schenectady, State of New York, have invented certain new and useful Improvements in Electric Air-Compressors, of which the following is a specification. This invention relates to machines for 1 compressing air, and especially those used in connection with air-brake systems on railway cars.

The object ofthe invention is to provide an improved pump of this kind, driven by an electriomotor, for use in the air-brake .equipment of electrically operated railway cars and trains. h

Electric air pumps have been used heretofore but they are usually composed of a small high speed motor geared down to a pump, forming a rather bulky and awkward machine, and one that is noisy in operation. My inventionconsists in certain details of construction and'arrangement whereby a compact',.light, powerful and noiseless pump will be produced- It embodies a railway motor, directly connected to a double cylinder single-acting air-pump, arranged to run at a comparatively slow speed, and provided with means for ollin the moving parts and cooling the pump cyfinders.

In the accompanying drawing, Figure 1 Specification of Letters Patent. Application filed September 3, 1301. Serial No. 74,244.

. frame A.

Patented Feb. 1,1910.

covers and doors A which close the openings a in the top,-bottom and walls of the casing. This mode of keeping the motor cool is n. Priest, 727,686, May 12, 1903.

The journal bearings of1hearmatureshaft are in heads A A slightly larger'fhan the armature, so that when either of said heads is removed, the armature can be drawn out of the motor. The brush-holders (not shown) are mounted on the insideof the The construction of these brushholders is shown and claimed in a patent to A. F. Batchelder, 727,l'7l, May 12, 1903.

The ends of the armature are countersunk to enable the journal hearings to be located partially inside of them, in order to obtain long bearings without unduly lengthening the motor.

The journal 0' at the commutator end of the shaft may be of the usual size, but the one c at the other end is made quite large in diameter in order to rmit a crank in D to project from its en and wholly wit in its peripheral limits. By this construction, the pin does not interfere with the'len th- -wise removal of the shaft when the hea A is a top plan view of my unproved electric air-pump. Fig. 2 is a longitudinal horizon i tel section thereof. Fig. 3 is a side eleva-,

tion. Fig. 4 is a sectional elevation lengthwise of the motor. Fig. 5 is an end elevation. Fig. 6 is a sectional elevation lengthwise of the pump cylinder. Fig. T is a top plan view of the am piston. Fig. 8 is a section of the cran en of the pitman. Fig. 9 is an enlarged section of one of the valves. Fig. 10 shows a modified door. F ig.' 11 is a cross section of the same on the line 11--11,

Fig. 10. r

The motor is of the inclosed type, having a casing A inside of which are contained the field coils B and thearmature B, whosediameter is as large as possible in order to give great torque and low speed. The armature shaft C is tubular, with radial holes 0 to '2 and 4.

is taken off. The crank-pin is preferably hollow, as indicated by dotted lines" in Figs.

The head A is preferably cast integral 5 with a rectangular box E projecting beyond the bearing a of the journal 0 and forminga housing for the crank-pin D to work in. The front of this box is closed by a hinged lid E, provided with a clamping-screw e. A chamber F surrounds the bearin 0, with an opening at the top provided wit a lid f,

and a drain-outlet in the bottom closed by a screw-plug f. The chamber may befilled with Oll to kee the bearing 6 lubricated.

Projecting rom each end of the box E is a pump-cylinder G, preferabl integral with said box, and provided wit external circumferential ribs 9 to radiate the heat of the air compressed in the cylinders. The two cylinders are in line with each other, their axis being at right angles tofthe aids of the armature shaft, and intersecting it at a point beyond the end of the journal 0 about half the length of the crank-pin D.

In each cylinder is a piston H, the two being connected by upper and lower tiebars 11., preferably cast integral with the pistons, and located in the plane of their peripheries. The tie-bars are preferably strengthened by internal ribs h, radial to the bearings h, whose common axis is transverse to that of the cylinders, and also parallel with the axis of the armature shaft. Apitman or connecting rod I is pivoted at one end between these bearings, itsother end being) pivotall connected with the crank P as reat a crank-throw as possible, the crank en of the rod may be cut away at top and bottom to straddle the tie-bar h when the crank-pin is on the quarter,- as shown in Figs. 2, 4, 6, and 8, the surface of the pin coming close to the inside of the-tie-bar, as

shown. The working part 'of one of the pump-cylinders is farther. from the shaft C than that of the otherto permit the use of as long a connecting rod as possible.

Secured to the connecting-rod is a sheetmetal finger K which at every revolution dips through a hole 1 into an oil-cellar L under the box E, preferably integral therewith.

' On the crank-pin is fastened a sheet-metal arm M having a hook m at one end adapted to pass under the end of the finger K when the latter is at the hi hest point in its path, and receive from said finger the drop of oil it has brought up. The rotating arm M throws the oil by centrifugal force into all parts of the space' between the two pistons,

thus keeping ,everything well lubricated.

This oiling device forms the subject of a atent to George Macloskie, No. 730 676, une 9, 1903. The door E tions e or slots a for ventilation, anda baffle plate on the insideto kee the oil from being thrown out ,of said per orations: said late being either solid as at E, or slotted as at E", the slots alternating with those in the door as shown in Fig. 11.

The heads G of the' pum -cylinders are secured by screwbolts-G, and are preferably provided with concentric ribs g to radiate ieat. valves N and one or more outlet valves N, made substantially as shown ina atent to A. F. Batchelder, #883,928, Apri 7, 1908. Each valve is preferably made up of a gang of small disk valves n, all mounted in a cas and the noise and whistling reduced to a minimum. To avoid confusion, the small valves are not shown in Fig. 6, but are separately illustrated in Fig. 9. The air drawn in through the inlet valves N and compressed in the cylinders flows through the outlet valves N into a passage P and thence to a delive -pipe P.-

It Wlll be seen that my air-compressor is compact and yet powerful, that it is strong pistons. One piston has behind it-two In or er to save space and obtainhas per ora- Each head carries one or more inlet casing to be turned completely over'ifdesired, so that it can .bedplaced upon a floor or similar support instea the car by bolting it up to the under side of the floor timbers.

of being hung under It has been stated that the'head A is pref erably cast inte ral with a box E, but it is evident that theiox may be omitted, and the cylinders G supported solely by their integral connection with the head A. It is also evident that the number of pump cylinders "is not necessarily restricted to two.

What I claim as new and desire to secure by Letters Patent of the UnjtedStates, is-- 1. The combination with a. reciprocating air compressor, of a motor having itsframe rigidly connected to said compressor and provided with an axially removable driveshaft one end of which is provided with an enlar ed journal, a crank-pi'nlocated atthc end-thereof and entirely within the peripheral limits of said journal, an operative connection between said crank-pin and the reciprocating member of the air compressor, and a bearing for said enlarged 1ournal whereby the motor and compressor may be separated axially of the drive shaft.

2, The combination with an' air compressor, of adriving motor, an axially removable drive shaft for said motor, an en- .largedjournal at one end of said shaft, a

crank-pin on said end within the peripheral limits of the journal, a connection between said crank-pin and the movable member of th compressor, and a bearing for said journa rmitting axial removal of said driving she. in a directlon away from the crankpm ,end.

3. The combination with a driving motor comprising a frame, a driving shaft having an enlarged journal at one on and a crankpin on said end within the peripheral limits of said enlarged journal, of an air com ressor comprising an operatin connection etween said crank-pin and t e movable member of the compressor, a frame detachably secured to the frame ofsaid driving motor, and a bearing for said enlarged journal formed in and extending through one side of the frame'of the compressor, and permitting a'xial movement of t e shaft through the bearing in a direction away from the cm and crank-pin end, whereby ti" the driving motor may be separated axially of the driving shaft.

4. In combination, an air compressor having a frame supporting opposed cylinders, 1pistons in said cylinders, a driving motor aving its frame detachably secured to said compressor \frame, an enlarged journal at one end of the motor shaft, a crank-pin on said end within the peripheral limits of said enlarged journal, a cyl1ndrical bearing for i said journal extending through one side of the com ressor frame between said cylinders, an a connection between said crankpin. and said istons.

5. The com ination with a rotary motor comprising -a frame, a drive shaft havin an enlarged journal at one end and a cran -on said end within the peripheral limits of the journal, of a compressor comprising a reclprocatlng piston, connections between a frame secured bearing for said journal extending through one side of the frame of the compressor.

6. The combination with a motor casing, of an inclosing'headtherefor containing a a journal bearing for the main drive-shaft and said head having two integral aline pump cylinders and a box forming a housmg for the operative connection between the motor and pump.

7. The combmation with a motorcomprising a casing and a drive-shaft having an enlarged journal at one end, of a detachable inc osing head for said casing, two

alined pump cylinders integrally connected to said head, a bearing for the enlarged journal 'movable axially of the shaft away from the motor and carried by said head, a crank on the 'ournal-within the peripheral limits of the earing, and a connection between said crank and the pistons of said cylinders.

v8. The combination with a motor comprism a casing and a drive-shaft "having an en arged journal at one ,end, of a detachable for said casing, two alined ump cylinders integrally connected to said i iiead, a bearing for the enlarged journal movable axially of the shaft away from t'he motor and carried the journal within the peripheraI limits of the bearing, a connection between said crank and the pistons of said c linders, a housin for the crank, and an oi cellar below sai housing.

, inclosing head 7 said tie-bars, and aifconnecting-rod pivoted ing with to one of said'pistonsand enga the plane said crankin on opposite sides 0 of said tiears. Y

lL'The combination with two um c linders inline withgeach other, of a dbu le piston comprisingtwo piston heads, two integral tie-bars uniting said istons in the plane of their ripheries,ra ial ribs inside said bars and earings on one piston in the lane of said tie-bars and whose axis is at right an les to that of the pistons, an actuating cran .pin revolving between and in the plane of said tie bars, and a connecting rod pivoted to one of said pistons and engaging said crank in on opposite sides of the plane of said tie ars.

In witness whereof, I have hereunto set my hand this 30th day of August, 1901.

ASA F. BATQHELDER. Witnesses:

EDWARD WILI rams, Jr., M. H. EMERSON.

by said head, a crank on 9. T ecombination with two alined cyl- 

